package BTTL06;

public interface CommandItf{
	public Phanso tong (Phanso ps1, Phanso ps2);
	public Phanso hieu (Phanso ps1, Phanso ps2);
	public Phanso tich (Phanso ps1, Phanso ps2);
	public Phanso thuong (Phanso ps1, Phanso ps2);
}
